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MIPS: generic: Convert SEAD-3 to a generic board

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Convert the MIPS SEAD-3 board support to be a generic board, supported
by generic kernels.

Because the SEAD-3 boot protocol was defined long ago and we don't want
to force a switch to the UHI protocol, SEAD-3 is added as a legacy board
which is detected by reading the REVISION register. This may technically
not be a valid memory read & future work will include attempting to
handle that gracefully. In practice since SEAD-3 is the only legacy
board supported by the generic kernel so far the read will only happen
on SEAD-3 boards, and even once Malta is converted the same REVISION
register exists there too. Other boards such as Boston, Ci20 & Ci40 will
use the UHI boot protocol & thus not run any of the legacy board detect
functions.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14354/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton
2016-10-05 18:18:21 +01:00
committed by Ralf Baechle
parent eed0eabd12
commit 3f5f0a4475
22 changed files with 152 additions and 730 deletions
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7
arch/mips/generic/Kconfig
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@@ -9,4 +9,11 @@ config LEGACY_BOARDS
kernel is booted without being provided with an FDT via the UHI
boot protocol.
config LEGACY_BOARD_SEAD3
bool "Support MIPS SEAD-3 boards"
select LEGACY_BOARDS
help
Enable this to include support for booting on MIPS SEAD-3 FPGA-based
development boards, which boot using a legacy boot protocol.
endif